“…In laser shock peening (LSP), as the laser beam is focused on the material surface, the metal absorbs laser energy and the plasma shock wave forms [17] , [18] . Shock wave and water-jet generate in cavitation peening (CP) originates from the collapse of the cavitation bubble [19] , [20] , [21] . In comparison, the mechanism of LCP is more complicated, which combines the LSP and CP.…”
“…In laser shock peening (LSP), as the laser beam is focused on the material surface, the metal absorbs laser energy and the plasma shock wave forms [17] , [18] . Shock wave and water-jet generate in cavitation peening (CP) originates from the collapse of the cavitation bubble [19] , [20] , [21] . In comparison, the mechanism of LCP is more complicated, which combines the LSP and CP.…”
“…The percentage of overlapping is the ratio of the total area covered by two consecutive laser spots. Overlap of the spot influences the distribution of uniform stresses [74][75][76]. The overlapping can be controlled by varying CNC X-Y moving stage.…”
Section: Overlapping Percentagementioning
confidence: 99%
“…Moreover, the larger spot size (greater than 1 mm) acts as a planar front and attenuates as 1/ r , and smaller diameters show larger CRS at the surface, as shown in Figure 7. Figure 7 Average residual stress for different spot sizes (Reprinted with permission [74])…”
Section: Laser Peening As Surface Modification Technique: An Introduc...mentioning
Laser shock peening (LSP) is a unique and efficient surface modification technique that surface engineers have commonly adopted to tailor metallic materials' surface and subsurface properties. The primary goal of this review paper is to highlight LSP as a surface modification technique for materials used in aeroengine, as this further ameliorates the commercialization of LSP in aeroengine sectors. The recent research articles focused on the application of LSP to improve the surface characteristics (i.e. surface residual stresses, hardness) and to resist the corresponding service challenges (i.e. fatigue, wear) of the aeroengine metallic material have been reviewed. In addition, a brief explanation of LSP and its controlling parameters is included. From the aeroengines perspective, challenges and future aspects for improving LSP application and commercialization are summarised based on the authors' experience and published literature.
“…Laser hardening techniques like peening, alloying, and cladding have been investigated to enhance resistance to cavitation by modifying surface composition and structure. [14][15][16] In addition to material properties, cavitation erosion resistance is also greatly affected by material microstructures. Some researchers suggested that surface topography like pitting, pores, and fractures contributes to the formation of water mats and has positive effect on reducing cavitation erosion.…”
Section: Introductionmentioning
confidence: 99%
“…Laser hardening techniques like peening, alloying, and cladding have been investigated to enhance resistance to cavitation by modifying surface composition and structure. 14–16…”
Microgrooves of different widths and microgrooves structures with varying widths were engraved on the surface of 6061 aluminum alloy using fiber laser marking equipment. In order to investigate the influence of the width of microgrooves on its cavitation behavior, cavitation tests on the microgroove structure were performed using an ultrasonic vibration apparatus. The hardness, the surface roughness, and the microscopic morphology of the samples were examined with a digital microhardness tester, a digital three-dimensional video microscope, and a scanning electron microscope, respectively. The results demonstrated that, increasing microgroove size was conducive to inhibition of cavitation erosion while decreasing microgroove size had an opposite effect. The surface microgrooves group elongated the incubation period of aluminum alloy in the cavitation tests, and noticeably increased the cavitation resistance of the aluminum alloy. It was also concluded that, the microgrooves group could transform microjets aiming at the alloy surface to the inside of microgrooves, and absorbed the impacted energy from microjets, leading to a remarkable anticavitation effect.
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